不同饲养密度对棉铃虫蛾寿命和生殖力的影响

测定了不同饲养密度下棉铃虫蛾的寿命和生殖特性。结果表明，棉铃虫成虫的寿命因不同的饲养条件和性别而异。单头饲养时，雌蛾寿命４－３７ｄ，平均１８．９ｄ；雄蛾５－２６ｄ，平均１５．８ｄ；雌雄寿命差异不显著。单对瓶养和每笼１０对饲养蛾雌雄寿命亦无显著差异。但不同饲养密度下雌蛾或雄蛾寿命均呈显著或极显著差异。单对饲养蛾产卵量最高达２５００粒。最低权１粒；单对和１０对饲养蛾平均每雌产卵量分别为９０７粒和９５３

Influence of different rearing densities on longevity and fecundity of Helicoverpa armigera moths

The longevity and fecundity of the cotton bollworm, Helicoverpa armigera were compared at different rearing densities namely single moth (SM) or a pair in a jar (APM), 10 (10PM) or 30(30PM) pairs in a cage. It was found that moths in SM have the longest living days, the average longevities of female and male being 18.9 and 15.8 days, respectively. The average number of eggs laid by per female in APM and 10PM were 907 and 953 respectively, showing little difference between them. While moths in 10PM and 30PM laid eggs in earlier stage than those in SM and APM. The maximum and minimum number of eggs per female were 2 500 and 1. Female in APM, 10PM or 30PM received an average number of spermatophore of 0.94, 1.90 and 0.81. About 30%, 10% and 40% females did not mate. Therefore, rearing 10 pairs of moth in a cage was better.